A long chassis needs long pickups. For the railcar fitting starts by gluing a couple of strips of PCB to the top of the metal sheet. Nice thin PCB too, better than the sleeper strip I normally use !
The pickups themselves are phosphor bronze wire. A length is supplied but I swapped it for some thicker stuff which I felt would hold its shape better. This might not have been a wise move as getting the pressure on the wheels light enough so picking up electricity didn't cause braking wasn't easy. Even when working, some weight is needed over the powered axle to get the thing moving.
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